CVE-2024-43853— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于 cgroup/cpuset 模块在读取/proc/cpuset时可能发生释放后重用，需要在proc_cpuset_show中使用rcu_read_lock来解决。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | a79a908fd2b080977b45bf103184b81c9d11ad07< 27d6dbdc6485d68075a0ebf8544d6425c1ed84bb |
affected |
a79a908fd2b080977b45bf103184b81c9d11ad07< 10aeaa47e4aa2432f29b3e5376df96d7dac5537a |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 688325078a8b5badd6e07ae22b27cd04e9947aec |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 4e8d6ac8fc9f843e940ab7389db8136634e07989 |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 29a8d4e02fd4840028c38ceb1536cc8f82a257d4 |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 96226fbed566f3f686f53a489a29846f2d538080 |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 29ac1d238b3bf126af36037df80d7ecc4822341e |
affected | ||
a79a908fd2b080977b45bf103184b81c9d11ad07< 1be59c97c83ccd67a519d8a49486b3a8a73ca28a |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2024-43853 基础信息
漏洞信息
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Vulnerability Title
cgroup/cpuset: Prevent UAF in proc_cpuset_show()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
cgroup/cpuset: Prevent UAF in proc_cpuset_show()
An UAF can happen when /proc/cpuset is read as reported in [1].
This can be reproduced by the following methods:
1.add an mdelay(1000) before acquiring the cgroup_lock In the
cgroup_path_ns function.
2.$cat /proc/<pid>/cpuset repeatly.
3.$mount -t cgroup -o cpuset cpuset /sys/fs/cgroup/cpuset/
$umount /sys/fs/cgroup/cpuset/ repeatly.
The race that cause this bug can be shown as below:
(umount) | (cat /proc/<pid>/cpuset)
css_release | proc_cpuset_show
css_release_work_fn | css = task_get_css(tsk, cpuset_cgrp_id);
css_free_rwork_fn | cgroup_path_ns(css->cgroup, ...);
cgroup_destroy_root | mutex_lock(&cgroup_mutex);
rebind_subsystems |
cgroup_free_root |
| // cgrp was freed, UAF
| cgroup_path_ns_locked(cgrp,..);
When the cpuset is initialized, the root node top_cpuset.css.cgrp
will point to &cgrp_dfl_root.cgrp. In cgroup v1, the mount operation will
allocate cgroup_root, and top_cpuset.css.cgrp will point to the allocated
&cgroup_root.cgrp. When the umount operation is executed,
top_cpuset.css.cgrp will be rebound to &cgrp_dfl_root.cgrp.
The problem is that when rebinding to cgrp_dfl_root, there are cases
where the cgroup_root allocated by setting up the root for cgroup v1
is cached. This could lead to a Use-After-Free (UAF) if it is
subsequently freed. The descendant cgroups of cgroup v1 can only be
freed after the css is released. However, the css of the root will never
be released, yet the cgroup_root should be freed when it is unmounted.
This means that obtaining a reference to the css of the root does
not guarantee that css.cgrp->root will not be freed.
Fix this problem by using rcu_read_lock in proc_cpuset_show().
As cgroup_root is kfree_rcu after commit d23b5c577715
("cgroup: Make operations on the cgroup root_list RCU safe"),
css->cgroup won't be freed during the critical section.
To call cgroup_path_ns_locked, css_set_lock is needed, so it is safe to
replace task_get_css with task_css.
[1] https://syzkaller.appspot.com/bug?extid=9b1ff7be974a403aa4cd
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于 cgroup/cpuset 模块在读取/proc/cpuset时可能发生释放后重用，需要在proc_cpuset_show中使用rcu_read_lock来解决。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-43853 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-43853 补丁与修复 (4)
CVE-2024-43853 其他参考 (4)
同批安全公告 · Linux · 2024-08-17 · 共 109 条
| CVE-2024-42285 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-42284 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-42318 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43848 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43847 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42287 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42296 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43832 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42297 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42280 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43846 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43845 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42314 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42279 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43830 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42299 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42300 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42293 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42288 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-43840 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 109 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-43853
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